The engineer of PE water supply pipe production line describes how to repair the screw barrel and screw after wear
The engineer of PE water supply pipe production line describes how to repair the screw barrel and screw after wear1. Screw and screw barrel are two important parts of a plastic mechanical extruder. If damaged, it will affect the operation of the machine and the plasticization of the material. How to repair the screw barrel and screw of the extruder after they are worn out?
1. Unscrew the screw. Unscrew the screw. According to the actual inner diameter of the screw barrel, the new screw diameter deviation is given according to the normal gap with the screw barrel for manufacturing.
2. After the surface treatment of the thread with the reduced diameter of the wear-resistant screw, the wear-resistant alloy is thermally sprayed and then ground to a certain size.
3. Overlay welding of wear-resistant alloy on the threaded part of wear-resistant screw. According to the degree of wear of the screw, 1-2mm thick surfacing welding is carried out, and then the screw is ground to a certain size. The wear-resistant alloy is composed of carbon, chromium, vanadium, cobalt, tungsten, boron and other materials. To increase the wear resistance and corrosion resistance of the screw.
PE water supply pipe production line
4. Repair screws can also be plated with hard chrome. Chromium is also a wear-resistant and corrosion-resistant metal, but the hard chromium layer is easy to fall off.
2. The inner surface hardness of the screw barrel is higher than that of the screw, and its damage comes later than the screw. The scrap of the screw barrel is the increase in the diameter of the inner diameter due to time wear. The employees of the PE water supply pipe production line believe that its repair method is as follows:
PE water supply pipe production line
1. If there is a certain nitride layer on the screw barrel whose diameter has increased due to wear, the inner hole of the screw barrel can be directly drilled and ground to a new diameter, and then a new screw can be prepared according to this diameter.
2. The inner diameter of the screw barrel is processed, trimmed and recast to a thickness of 1-2mm, and then finished to the required size.
3. Under normal circumstances, the homogenizing part of the spiral drum wears faster. This part (5~7D length) can be trimmed by drilling and equipped with nitrided alloy steel bushing. The diameter of the inner hole should refer to the diameter of the screw, and should be kept in the normal fit clearance for processing and preparation.
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